The paper presents soil features and chemical composition in a self-heating coal-waste dump. The investigations were carried out in the Upper Silesian Coal Basin. A fire zone in which the soil temperature exceeded 50°C was selected for our study. Soil analyses were carried out for three grain sizes – d > 1 mm, 0.063 mm < d ≤ 1 mm, and d ≤ 0.063 mm – enabling identification of the diversity of the chemical composition in soil fractions. The highest concentration of heavy metals is represented by Mn (212–6972 mg kg^-1), Zn (127–3283 mg kg^-1), Pb (33.6–1344.7 mg kg^-1), Cu (38.9–101.4 mg kg^-1), and major elements by Fe (14,300–117,400 mg kg^-1) and Ca (900–63,600 mg kg^-1). Soil chemistry showed variations within individual studied sites. The soil reaction ranges from acidic (4.3 in KCl and 5.26 in H₂O) to moderate alkaline (7.96 in H₂O and 7.31 in KCl), whereas TOC ranges from 1.21% to 14.60% and TN from 0.023% to 0.291%. The distribution of n-alkanes clearly showed a low degree of transformation of organic matter and characteristic high values of Pr/Ph ratio for humic coals and coal waste in the region. Grains with diameters greater than 1 mm exhibited completely different features than those of fractions smaller than or equal to 1 mm. High organic carbon content (14.60) was detected in the samples along with PAHs. The influence of fire on the chemical composition of all samples was identified using geochemical indicators. PCA analysis showed that the values of the variables were more closely correlated in finer grains than in the coarsest fraction.

中文翻译：

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垃圾场自热引起的土壤化学成分变化

该论文介绍了自热煤垃圾堆场的土壤特征和化学成分。调查是在上西里西亚煤盆地进行的。我们选择了土壤温度超过 50°C 的火区进行研究。对三种粒度进行了土壤分析——d > 1 mm、0.063 mm < d ≤ 1 mm 和 d ≤ 0.063 mm——能够识别土壤组分中化学成分的多样性。重金属的最高浓度被Mn（212-6972毫克千克表示^-1），锌（127-3283毫克千克^-1），铅（33.6-1344.7毫克千克^-1），铜（38.9-101.4毫克公斤^{- 1} )，主要元素是 Fe (14,300–117,400 mg kg ^-1 ) 和 Ca (900–63,600 mg kg ^-1）。土壤化学显示个别研究地点内的变化。土壤反应范围从酸性（在 KCl 中为 4.3，在 H ₂ O 中为5.26 ）到中等碱性（在 H ₂ O 中为7.96，在 KCl 中为 7.31），而 TOC 的范围为 1.21% 至 14.60%，TN 为 0.023% 至 0.291%。n的分布-烷烃清楚地显示出该地区腐殖质煤和废煤的有机质转化程度低和 Pr/Ph 比值高的特征。直径大于 1 毫米的颗粒与小于或等于 1 毫米的颗粒表现出完全不同的特征。在样品中检测到高有机碳含量 (14.60) 以及多环芳烃。使用地球化学指标确定了火灾对所有样品化学成分的影响。PCA 分析表明，与最粗部分相比，细颗粒中的变量值更密切相关。